The Research of SVG Based on the Unbalanced Power System

With the increasing consumption of reactive power, negative sequence component generated by unbalanced three-phase system has seriously affected the power quality, power system stability and economic operation. In this paper, the static var generator is used to compensate the reactive power and would control the negative sequence current caused by unbalanced load. Instantaneous detection of reactive power can separate the fundamental positive sequence reactive current and negative sequence current and establish the synchronization control strategy for dual d-q coordinate sequence. This paper also realizes the synchronous control of reactive power and negative sequence component. The SVG system simulation model is built in this paper. Simulation results show that the proposed method can effectively compensate the negative sequence component and reactive power, which greatly improves the power quality and stability of the system.